1 files changed, 48 insertions, 0 deletions
diff --git a/debian/patches/75_06-Docs-Add-note-on-lsearch-for-IPv4-mapped-IPv6-addres.patch b/debian/patches/75_06-Docs-Add-note-on-lsearch-for-IPv4-mapped-IPv6-addres.patch
new file mode 100644
index 0000000..a7863ef
--- /dev/null
+++ b/debian/patches/75_06-Docs-Add-note-on-lsearch-for-IPv4-mapped-IPv6-addres.patch
@@ -0,0 +1,48 @@
+From 8dde16b89efe2138f92cbfa6c59fb31dc80ec22a Mon Sep 17 00:00:00 2001
+From: Jeremy Harris <jgh146exb@wizmail.org>
+Date: Tue, 19 Feb 2019 14:45:27 +0000
+Subject: [PATCH 2/5] Docs: Add note on lsearch for IPv4-mapped IPv6 addresses
+
+Cherry-picked from: 52af443324, c77d3d85fe
+---
+ doc/doc-docbook/spec.xfpt | 11 ++++++++++-
+ doc/ChangeLog     |  2 +-
+ 2 files changed, 11 insertions(+), 2 deletions(-)
+
+--- a/doc/ChangeLog
++++ b/doc/ChangeLog
+@@ -18,7 +18,7 @@ JH/07 GnuTLS: Our use of late (post-hand
+       TLS connection attempt, so that the normal retry-in-clear can work (if
+       suitably configured).
+ 
+-JB/01 BZg 2375: fix expansions of 822 addresses having comments in local-part
++JB/01 Bug 2375: fix expansions of 822 addresses having comments in local-part
+       and/or domain.  Found and fixed by Jason Betts.
+ 
+ 
+--- a/doc/spec.txt
++++ b/doc/spec.txt
+@@ -6302,6 +6302,10 @@ The following single-key lookup types ar
+     implicit key is the host's IP address rather than its name (see section
+     10.12).
+ 
++    Warning 3: Do not use an IPv4-mapped IPv6 address for a key; use the
++    IPv4, in dotted-quad form. (Exim converts IPv4-mapped IPv6 addresses to
++    this notation before executing the lookup.)
++
+   * lsearch: The given file is a text file that is searched linearly for a line
+     beginning with the search key, terminated by a colon or white space or the
+     end of the line. The search is case-insensitive; that is, upper and lower
+@@ -8003,7 +8007,11 @@ quote keys was made available in lsearch
+ implemented iplsearch files do require colons in IPv6 keys (notated using the
+ quoting facility) so as to distinguish them from IPv4 keys. For this reason,
+ when the lookup type is iplsearch, IPv6 addresses are converted using colons
+-and not dots. In all cases, full, unabbreviated IPv6 addresses are always used.
++and not dots.
++
++In all cases except IPv4-mapped IPv6, full, unabbreviated IPv6 addresses
++are always used. The latter are converted to IPv4 addresses, in dotted-quad
++form.
+ 
+ Ideally, it would be nice to tidy up this anomalous situation by changing to
+ colons in all cases, given that quoting is now available for lsearch. However,